US4682747A - Utility insulated cross-arm - Google Patents

Utility insulated cross-arm Download PDF

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Publication number
US4682747A
US4682747A US06/855,836 US85583686A US4682747A US 4682747 A US4682747 A US 4682747A US 85583686 A US85583686 A US 85583686A US 4682747 A US4682747 A US 4682747A
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US
United States
Prior art keywords
arm
triangular frame
utility
cross
recited
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/855,836
Inventor
Halm C. King, Jr.
Nancy King
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PROGRESSIVE POWER PRODUCTS Inc
Original Assignee
King Jr Halm C
Nancy King
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by King Jr Halm C, Nancy King filed Critical King Jr Halm C
Priority to US06/855,836 priority Critical patent/US4682747A/en
Priority to PCT/US1987/001765 priority patent/WO1989001108A1/en
Application granted granted Critical
Publication of US4682747A publication Critical patent/US4682747A/en
Assigned to CAI UNIT, INC. reassignment CAI UNIT, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KING, HALM C., KING, NANCY
Anticipated expiration legal-status Critical
Assigned to PROGRESSIVE POWER PRODUCTS, INC. reassignment PROGRESSIVE POWER PRODUCTS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CAI UNIT INC.
Application status is Expired - Lifetime legal-status Critical

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00Installations of electric cables or lines in or on buildings, equivalent structures or vehicles
    • H02G3/24Installation of lines or cables on walls, ceilings or floors by means of insulators

Abstract

A cross-arm for supporting electric utility wires. The cross-arm is made of insulative material, the inner structure formed of alternate layers of polyester resins and synthetic fabric. An inner core is composed of polyester resin and particulate matter, or polyurethane foam with a central metal reinforcing bar. The cross-arm is modular in nature, and support members are integral with the unit, facilitating installation.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a modular cross-arm support structure for supporting a plurality of power transmission lines on a support structure, such as a vertical pole. More specifically, the present invention provides a utility insulated cross-arm which can be installed quickly and easily, and which provides a plurality of electrical insulators in a fixed spaced relation to ensure adequate separation between the transmission lines carried on the structure.

2. Description of Related Art

Since the earliest use of power transmission lines, there has been a recognition of the need to support the lines above the ground to provide isolation between the lines and the environment. One of the most common arrangements for supporting transmission lines comprises a plurality of electrical insulators mounted on wooden cross-arms attached to vertical wooden poles. Such structures are generally constructed in a sequential manner with a first work crew mounting the wooden poles in the ground, followed by a second work crew which secures the cross-arms to the poles and mounts the electrical insulators on the cross-arms.

Wooden support structures of the type described above have a number of shortcomings, both with regard to durability and with regard to ease of construction. The wooden poles and cross-arms are subject to deterioration from exposure to the environment and from internal defects in the materials.

SUMMARY OF THE INVENTION

The utility insulated cross-arm overcomes the above-mentioned difficulties by providing a modular power transmission support structure which can be manufactured at a central location, transported as a complete unit to a remote location, and then installed in a very short period of time. The cross-arm structure comprises a generally triangular central portion and two horizontal arms extending laterally from the base of the central triangular portion. In the preferred embodiment, the triangular central portion and the laterally-extending arms are comprised of members having a generally square cross-section. An electrical insulator adapted to carry a power transmission line is mounted on the top of the central triangular portion of the structure and on the upper surface of each of the laterally extending horizontal arms. The insulators are attached in a predetermined, fixed, spaced relation which ensures adequate electrical separation between the transmission lines carried on the insulators.

The structural members of the cross-arms comprise an outer shell formed from a polyester resin material and a plurality of alternating layers of polyester resin material and synthetic fabric contained within the shell. The inner core of each structural member contains a longitudinally extending metal bar or cable surrounded by a mixture of polyester resin and particulate matter.

The utility insulated cross-arm support structure for power transmission lines can be mounted quickly and easily on a vertical pole by a single installer working alone. The cross-arm is extremely resistant to deterioration resulting from exposure to the environment and from damage caused by vandals or wild animals.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an elevational front view of the utility insulated cross-arm support structure of the present invention.

FIG. 2 is an elevational side view of the utility insulated cross-arm support structure of the present invention.

FIG. 3 is a cross-sectional side view taken along section lines 3--3 of FIG. 1 showing details relating to the internal structure of the utility cross-arm.

FIG. 4 is a perspective rear view of the utility cross-arm support structure of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference now to the Figures and in particular with reference to FIG. 1, there is depicted a front view of the utility insulated cross-arm 10. Utility insulated cross-arm 10 is generally comprised of a triangular frame 12 having a peak 14 and a base 16, and left and right horizontal cross-arms 18 and 20, respectively. The horizontal cross-arms 18 and 20 are preferably in the same plane as the triangular frame 12 as is shown in FIG. 2. Resting on the upper surface of cross-arms 18 and 20 are lateral supports 22 and 24, located at the distal ends of the cross-arms. An upper support 26, similar to lateral supports 22 and 24, rests on the peak 14 of triangular frame 12. Each of supports 22, 24 and 26 is rectangular in shape, tapering to form longitudinal depressions 30 and 32, and then flaring to form an upper surface 34. The upper surface 34 has a trough 36 therein to provide more stable support for utility lines.

With reference now to FIG. 3, there is depicted a cross-sectional view of horizontal cross-arm 18. Note that FIG. 3 could also represent cross-sectionals of horizontal cross-arm 20, base 16, or either of the diagonal members of triangular frame 12. The outer shell of cross-arm 18 is composed of a polyester resin material 50. Inside the cross-arm are alternating layers of polyester resin 52 and a synthetic fabric 54. The inner core 56 is formed of a mixture of polyester resin and particulate matter. Inner core 56 may alternately be composed of polyurethane foam. A central metal bar 58 provides extra reinforcement. The bar 58 may alternately be a fiberglass rod or nylon cable.

With further reference to FIG. 4, there is depicted a rear perspective view of the utility insulated cross-arm 10. The device is mounted to a utility pole by means of upper holes 40 and lower hole 42. In the preferred embodiment, bolts are inserted through these holes and then fastened to the utility pole. The rear side of the utility cross-arm 10 has a curved surface 44 along the vertical center line to facilitate attachment of the device to the pole.

Electrical wires 60 rest in the trough 36 and are secured thereto by a strap 62 which overlaps wire 60 and is tautly placed around depressions 30 and 32 of support member 22, 24, or 26. Strap 62 may be replaced by a clamping mechanism 64 which rests upon upper surface 34 and clamps wire 60 to the support member by forcible contact with depressions 30 and 32.

Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiment will become apparent to persons skilled in the art upon reference to the description of the invention. It is therefore contemplated that the appended claims will cover such modifications that fall within the true scope of the invention.

Claims (18)

We claim:
1. A utility insulated cross-arm for supporting electrical wires from a utility pole comprising:
a triangular frame having a base and a peak, said triangular frame being constructed from an insulative material;
left and right horizontal cross-arms integral with said triangular frame and constructed from an insulative material, located at the base of said triangular frame, said horizontal cross-arms each having an upper surface;
an upper support member integral with and located at said peak of said triangular frame and constructed from an insulative material;
attachment means for attaching said electrical wire to said upper support member; and
mounting means for mounting said triangular frame to said utility pole, said mounting means comprised of a plurality of holes located along a vertical centerline of said triangular frame, for bolting said triangular frame to said utility pole.
2. A utility insulated cross-arm as recited in claim 1 wherein said left and right horizontal cross-arms are coplanar with said triangular frame.
3. A utility insulated cross-arm as recited in claim 2 wherein said left and right horizontal cross-arms have at the distal ends thereof a plurality of lateral support members, located on and integral with said upper surface of said left and right horizontal cross-arms and constructed from an insulative material.
4. A utility insulated cross-arm as recited in claim 1 wherein said triangular frame and said left and right horizontal cross-arms are comprised of:
an outer shell of polyester resin material;
a plurality of alternating layers of synthetic fabric and polyester resin material;
an inner core composed of a mixture of polyester resin and particulate matter; and
a central longitudinal metal reinforcing bar.
5. A utility insulated cross-arm as recited in claim 1 wherein said triangular frame and said left and right horizontal cross-arms are comprised of:
an outer shell of polyester resin material;
a plurality of alternating layers of synthetic fabric and polyester resin material;
an inner core composed of polyurethane foam; and
a central longitudinal fiberglass rod.
6. A utility insulated cross-arm as recited in claim 4 wherein said upper support member and said lateral support members are each comprised of and integral with a rectangular insulator having a support surface, said support surface having a trough for accommodating an electrical wire.
7. A utility insulated cross-arm as recited in claim 6 wherein:
said rectangular insulator has a left side and a right side; and,
each of said left and right sides of said rectangular insulator has a longitudinal depression parallel to said trough, located near the support surface of said rectangular insulator.
8. A utility insulated cross-arm as recited in claim 7 wherein said attachment means is comprised of a strap overlapping said electrical wire, being tautly held against said longitudinal depressions on each of said left and right sides of said rectangular insulator.
9. A utility insulated cross-arm as recited in claim 7 wherein said attachment means is comprised of a clamp resting upon said wire and said support surface of said rectangular insulator, said clamp having flanges which forcibly abut said longitudinal depressions on each of said left and right sides of said rectangular insulator.
10. A utility insulated cross-arm as recited in claim 1 wherein said triangular frame has a front side and a rear side, said rear side having a curved surface along said vertical center line to facilitate attachment of said triangular frame to said utility pole.
11. A utility insulated cross-arm as recited in claim 4 wherein said triangular frame has a front side and a rear side, said rear side having a curved surface along said vertical center line to facilitate attachment of said triangular frame to said utility pole.
12. A utility insulated cross-arm as recited in claim 6 wherein said triangular frame has a front side and a rear side, said rear side having a curved surface along said vertical center line to facilitate attachment of said triangular frame to said utility pole.
13. A utility insulated cross-arm as recited in claim 7 wherein said triangular frame has a front side and a rear side, said rear side having a curved surface along said vertical center line to facilitate attachment of said triangular frame to said utility pole.
14. A utility insulated cross-arm as recited in claim 8 wherein said triangular frame has a front side and a rear side, said rear side having a curved surface along said vertical center line to facilitate attachment of said triangular frame to said utility pole.
15. A utility insulated cross-arm as recited in claim 9 wherein said triangular frame has a front side and a rear side, said rear side having a curved surface along said vertical center line to facilitate attachment of said triangular frame to said utility pole.
16. A utility insulated cross-arm for supporting electrical wires from a utility pole comprising:
a rigid bar made of insulative material, having left and right ends, and a central portion;
two diagonal members integral with said bar, located on either side of said central portion of said bar, said diagonal members joined at a peak, forming a triangle with said bar;
a plurality of support members, one mounted at and integral with said peak, and others distributed along and integral with said bar, each having a support surface with a trough, for supporting said electrical wires, said support members also having lateral depressions;
attachment means for securing said electrical wires to said support members by rigidly fastening said attachment means to said electrical wire and said lateral depressions of said support members; and
a concave surface located at said peak of said diagonal members, and at said central portion of said bar, said concave surface running perpendicular to said bar, said concave surface having apertures therein for mounting said cross-arm to said utility pole.
17. A utility insulated cross-arm as recited in claim 16 wherein said rigid bar is comprised of:
a central longitudinal metal rod;
an inner core surrounding said rod, said inner core being a mixture of polyester resin and particulate matter;
alternating layers of polyester resin and synthetic fabric surrounding said inner core; and
an outer shell of polyester resin material.
18. A utility insulated cross-arm as recited in claim 16 wherein said rigid bar is comprised of:
a central longitudinal fiberglass rod;
an inner core surrounding said rod, said inner core being composed of polyurethane foam;
alternating layers of polyester resin and synthetic fabric surrounding said inner core; and
an outer shell of polyester resin material.
US06/855,836 1986-04-24 1986-04-24 Utility insulated cross-arm Expired - Lifetime US4682747A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06/855,836 US4682747A (en) 1986-04-24 1986-04-24 Utility insulated cross-arm
PCT/US1987/001765 WO1989001108A1 (en) 1986-04-24 1987-07-24 Utility insulated cross-arm

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US06/855,836 US4682747A (en) 1986-04-24 1986-04-24 Utility insulated cross-arm
JP50480587A JPH02504340A (en) 1986-04-24 1987-07-24
AT87905345T AT84604T (en) 1986-04-24 1987-07-24 Insulated QUERTRAEGER for electric cables.
PCT/US1987/001765 WO1989001108A1 (en) 1986-04-24 1987-07-24 Utility insulated cross-arm
DE19873783614 DE3783614D1 (en) 1986-04-24 1987-07-24 Insulated QUERTRAEGER for electric cables.
AU78015/87A AU602532B2 (en) 1986-04-24 1987-07-24 Utility insulated cross-arm
EP19870905345 EP0375675B1 (en) 1986-04-24 1987-07-24 Utility insulated cross-arm
DE19873783614 DE3783614T2 (en) 1986-04-24 1987-07-24 Insulated QUERTRAEGER for electric cables.

Publications (1)

Publication Number Publication Date
US4682747A true US4682747A (en) 1987-07-28

Family

ID=26776039

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/855,836 Expired - Lifetime US4682747A (en) 1986-04-24 1986-04-24 Utility insulated cross-arm

Country Status (7)

Country Link
US (1) US4682747A (en)
EP (1) EP0375675B1 (en)
JP (1) JPH02504340A (en)
AT (1) AT84604T (en)
AU (1) AU602532B2 (en)
DE (2) DE3783614D1 (en)
WO (1) WO1989001108A1 (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4920758A (en) * 1988-07-18 1990-05-01 Whirlpool Corporation Refrigerator temperature responsive air outlet baffle
US5009734A (en) * 1987-03-20 1991-04-23 Manufacture D'appareillage Electrique De Cahors Method of making an insulating support arm for an electric line pole
US5035383A (en) * 1989-02-16 1991-07-30 Rockwell International Corporation Space saver service clamp
US5048775A (en) * 1990-06-18 1991-09-17 Hungerford Charles S Jr Device for supporting a plurality of pipes in parallel relationship within a defined space
US5605017A (en) * 1994-01-13 1997-02-25 Pupi Enterprises L.L.C. Pultruded utility line support structure and method
US6027082A (en) * 1998-11-03 2000-02-22 Cai Unit, Inc. Convertible electric utility cross arm insulator unit
WO2001023691A1 (en) * 1999-09-28 2001-04-05 Electrical Moulded Components Pacific Pty. Ltd. Cross arm formed of insulator
US6347488B1 (en) 1999-06-29 2002-02-19 Jeffrey T. Koye Utility pole cross-arm
US6477977B1 (en) * 2001-09-27 2002-11-12 Furman Combes Method and apparatus for repelling land and water fowl from structures
US6667442B1 (en) * 2002-07-25 2003-12-23 Patent Holding Company, Ltd. Electric utility cross arm
US20040228995A1 (en) * 2003-05-12 2004-11-18 Boaz Yosef D. Composite poles with an integral mandrel and methods of making the same
US6834469B2 (en) 2001-01-24 2004-12-28 Geotek, Inc. Utility line support member
US6930243B1 (en) 2004-02-13 2005-08-16 Halm C. King, Jr. Ground wire insulator post for utility poles
US7007438B1 (en) * 2002-09-24 2006-03-07 Brooks Manufacturing Co. Crossarm systems and methods
CN100353627C (en) * 2000-08-28 2007-12-05 运送技术股份公司 Pole top support for aerial electric power lines
US20090319235A1 (en) * 2008-04-17 2009-12-24 Maclean-Fogg Company Fiberglass Cross Arm And Method Of Selecting Same
US20100218708A1 (en) * 2009-02-27 2010-09-02 Heath Carr Methods of reinforcing structures against blast events
US20110139503A1 (en) * 2009-12-11 2011-06-16 British Columbia Transmission Corporation Cementitious fibre reinforced composite cross arm
US20120255920A1 (en) * 2011-04-11 2012-10-11 Abb Technology Ag Electrical equipment mounting frame
US9546498B2 (en) 2014-06-18 2017-01-17 Power Composites, Llc Composite structural support arm

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU648739B3 (en) * 1993-08-23 1994-04-28 Dulmison (Nz) Limited Line support
WO2009049377A1 (en) * 2007-10-19 2009-04-23 Farallon Capital Pty Ltd Cross arm
US9784408B2 (en) 2015-08-27 2017-10-10 Austin Cary Bennett Resilient cross arm assembly

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Publication number Priority date Publication date Assignee Title
US1029207A (en) * 1911-07-18 1912-06-11 Oliver P Megahan Insulator-support.
US1239142A (en) * 1915-12-15 1917-09-04 Associated Engineers Company Cross-arm.
US2056366A (en) * 1934-01-20 1936-10-06 Smithjohns Inc Pole-top fixture
DE708528C (en) * 1938-07-02 1941-07-23 Paul Jordan Fixing clamp for different strong electric lines
US2453319A (en) * 1945-02-21 1948-11-09 Glenn L Martin Co Tube holding device
US2870311A (en) * 1955-12-19 1959-01-20 Kaiser Aluminium Chem Corp Electrical conductor and system
GB919534A (en) * 1959-10-07 1963-02-27 British Insulated Callenders Cross arms for supporting overhead electric lines
US3429758A (en) * 1966-01-24 1969-02-25 Edwin C Young Method of making filament wound structural columns
DE1540295A1 (en) * 1965-07-22 1970-01-02 Wilhelm Peter A process for the manufacture of insulated concrete poles for the production of lightning and overvoltage secure electrical cables,
US3531578A (en) * 1967-12-22 1970-09-29 British Insulated Callenders Structures for supporting overhead electric power lines
US3574104A (en) * 1968-01-24 1971-04-06 Plastigage Corp Glass fiber constructional member
US3603717A (en) * 1970-01-07 1971-09-07 Cp Corp Crossarm assembly
US3715460A (en) * 1971-06-11 1973-02-06 Detroit Edison Co Tubular deadend supports
DE2134471A1 (en) * 1971-07-10 1973-02-15 Pfleiderer Fa G A Mast for lines and lighting equipment
US3803345A (en) * 1973-03-12 1974-04-09 E Spaeth Crossarm
US3813837A (en) * 1972-10-16 1974-06-04 Cascade Pole Co Fiberglass pole and method and apparatus for fabricating same

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US2890311A (en) * 1956-10-31 1959-06-09 Dictograph Products Co Inc Thermal sensing unit

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1029207A (en) * 1911-07-18 1912-06-11 Oliver P Megahan Insulator-support.
US1239142A (en) * 1915-12-15 1917-09-04 Associated Engineers Company Cross-arm.
US2056366A (en) * 1934-01-20 1936-10-06 Smithjohns Inc Pole-top fixture
DE708528C (en) * 1938-07-02 1941-07-23 Paul Jordan Fixing clamp for different strong electric lines
US2453319A (en) * 1945-02-21 1948-11-09 Glenn L Martin Co Tube holding device
US2870311A (en) * 1955-12-19 1959-01-20 Kaiser Aluminium Chem Corp Electrical conductor and system
GB919534A (en) * 1959-10-07 1963-02-27 British Insulated Callenders Cross arms for supporting overhead electric lines
DE1540295A1 (en) * 1965-07-22 1970-01-02 Wilhelm Peter A process for the manufacture of insulated concrete poles for the production of lightning and overvoltage secure electrical cables,
US3429758A (en) * 1966-01-24 1969-02-25 Edwin C Young Method of making filament wound structural columns
US3531578A (en) * 1967-12-22 1970-09-29 British Insulated Callenders Structures for supporting overhead electric power lines
US3574104A (en) * 1968-01-24 1971-04-06 Plastigage Corp Glass fiber constructional member
US3603717A (en) * 1970-01-07 1971-09-07 Cp Corp Crossarm assembly
US3715460A (en) * 1971-06-11 1973-02-06 Detroit Edison Co Tubular deadend supports
DE2134471A1 (en) * 1971-07-10 1973-02-15 Pfleiderer Fa G A Mast for lines and lighting equipment
US3813837A (en) * 1972-10-16 1974-06-04 Cascade Pole Co Fiberglass pole and method and apparatus for fabricating same
US3803345A (en) * 1973-03-12 1974-04-09 E Spaeth Crossarm

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009734A (en) * 1987-03-20 1991-04-23 Manufacture D'appareillage Electrique De Cahors Method of making an insulating support arm for an electric line pole
US4920758A (en) * 1988-07-18 1990-05-01 Whirlpool Corporation Refrigerator temperature responsive air outlet baffle
US5035383A (en) * 1989-02-16 1991-07-30 Rockwell International Corporation Space saver service clamp
US5048775A (en) * 1990-06-18 1991-09-17 Hungerford Charles S Jr Device for supporting a plurality of pipes in parallel relationship within a defined space
US5605017A (en) * 1994-01-13 1997-02-25 Pupi Enterprises L.L.C. Pultruded utility line support structure and method
US6027082A (en) * 1998-11-03 2000-02-22 Cai Unit, Inc. Convertible electric utility cross arm insulator unit
GB2344226A (en) * 1998-11-03 2000-05-31 Cai Unit Inc Convertible electric utility cross arm insulator unit
FR2786620A1 (en) * 1998-11-03 2000-06-02 Cai Unit Inc Traverse convertible electric pole
GB2344226B (en) * 1998-11-03 2002-03-27 Cai Unit Inc Convertable electric utility cross arm insulator unit
AU751045B2 (en) * 1998-11-03 2002-08-08 Progressive Power Products, Inc. Convertible electric utility cross arm insulator unit
US6347488B1 (en) 1999-06-29 2002-02-19 Jeffrey T. Koye Utility pole cross-arm
WO2001023691A1 (en) * 1999-09-28 2001-04-05 Electrical Moulded Components Pacific Pty. Ltd. Cross arm formed of insulator
CN100353627C (en) * 2000-08-28 2007-12-05 运送技术股份公司 Pole top support for aerial electric power lines
US6834469B2 (en) 2001-01-24 2004-12-28 Geotek, Inc. Utility line support member
US6477977B1 (en) * 2001-09-27 2002-11-12 Furman Combes Method and apparatus for repelling land and water fowl from structures
US6667442B1 (en) * 2002-07-25 2003-12-23 Patent Holding Company, Ltd. Electric utility cross arm
US7007438B1 (en) * 2002-09-24 2006-03-07 Brooks Manufacturing Co. Crossarm systems and methods
US7329444B2 (en) 2003-05-12 2008-02-12 Pomm Plastics, Co Composite poles with an integral mandrel and methods of making the same
US20040228995A1 (en) * 2003-05-12 2004-11-18 Boaz Yosef D. Composite poles with an integral mandrel and methods of making the same
US20050178570A1 (en) * 2004-02-13 2005-08-18 King Halm C.Jr. Ground wire insulator post for utility poles
US6930243B1 (en) 2004-02-13 2005-08-16 Halm C. King, Jr. Ground wire insulator post for utility poles
US20090319235A1 (en) * 2008-04-17 2009-12-24 Maclean-Fogg Company Fiberglass Cross Arm And Method Of Selecting Same
US20100218708A1 (en) * 2009-02-27 2010-09-02 Heath Carr Methods of reinforcing structures against blast events
US8713891B2 (en) * 2009-02-27 2014-05-06 Fyfe Co., Llc Methods of reinforcing structures against blast events
US20110139503A1 (en) * 2009-12-11 2011-06-16 British Columbia Transmission Corporation Cementitious fibre reinforced composite cross arm
US20120255920A1 (en) * 2011-04-11 2012-10-11 Abb Technology Ag Electrical equipment mounting frame
US8919584B2 (en) * 2011-04-11 2014-12-30 Abb Technology Ag Electrical equipment mounting frame
US9546498B2 (en) 2014-06-18 2017-01-17 Power Composites, Llc Composite structural support arm
US9790704B2 (en) 2014-06-18 2017-10-17 Power Composites, Llc Composite structural support arm

Also Published As

Publication number Publication date
JPH02504340A (en) 1990-12-06
AU7801587A (en) 1989-03-01
AT84604T (en) 1993-01-15
WO1989001108A1 (en) 1989-02-09
EP0375675B1 (en) 1993-01-13
AU602532B2 (en) 1990-10-18
DE3783614D1 (en) 1993-02-25
DE3783614T2 (en) 1993-06-03
EP0375675A1 (en) 1990-07-04
EP0375675A4 (en) 1990-12-27

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